h2 {
    text-align: center;
    margin: 30px 0;
}

.demo-card {
    width: 100%;
    max-width: 600px;
    margin: 0 auto 100px;
}

.card-block{
    text-align: center;
}

h4.title {
    text-align: center;
}

.card-title {
    margin-bottom: 2rem;
}